The crossword solution for the term 'Brother of TV's Lisa and Maggie' is 'BART' (4 letters). BART Simpson is a fictional character from the long-running animated television series The Simpsons. He is the eldest child of Homer and Marge Simpson, and the brother of Lisa and Maggie. BART is an underachieving, rebellious, mischievous, and disruptive 10-year-old boy who is constantly in detention. He has been described as 'the quintessential Simpson'.